The metadata below describe the original scanning. Follow the "All Files: HTTP" link in the "View the book" box to the left to find XML files that contain more metadata about the original images and the derived formats (OCR results, PDF etc.). See also the What is the directory structure for the texts? FAQ for information about file content and naming conventions.
"Useful as a preparatory excursion before the reading of the author's much fuller and more explicit Outline of history is undertaken...It is not an abstract or condensation of that former work."